Re: FreeBSD 5.3b7and poor ata performance

try add
options PREEMPTION


fandino wrote:

> Kenneth Culver wrote:
>
>>> # dd if=/dev/stripe/test of=/dev/null bs=1024k count=1024
>>> 1073741824 bytes transferred in 30.072215 secs (35705445 bytes/sec)
>>>
>>> simply it doesn't makes any sense. With two disk I'd must have
>>> approx. 26K+26K=52 M/sec and with four 26K+26K+26K+26K=104 M/sec
>>>
>>> Other systems like OpenBSD had a good throughput 55000K/sec by disk
>>
>
>> ar0: 228880MB <ATA RAID0 array> [29178/255/63] status: READY subdisks:
>>  disk0 READY on ad4 at ata2-master
>>  disk1 READY on ad6 at ata3-master
>>
>> I get the following performance with dd:
>>
>> dd if=/dev/ad4 of=/dev/null bs=1m count=200
>> 209715200 bytes transferred in 3.538456 secs (59267433 bytes/sec)
>>
>> dd if=/dev/ad6 of=/dev/null bs=1m count=200
>> 209715200 bytes transferred in 3.551439 secs (59050767 bytes/sec)
>>
>> dd if=/dev/ar0 of=/dev/null bs=1m count=200
>
>
>> 209715200 bytes transferred in 1.837508 secs (114130226 bytes/sec)
>>
>> This is with a custom kernel with all debugging options off. I 
>> haven't seen a
>> mail from you yet that says whether you turned off debugging options 
>> in the
>> kernel or not, and if you haven't turned off debugging options, I'd 
>> strongly
>> suggest doing so.
>
>
> with my custom and stripped kernel (I attach it below) I don't see any 
> difference.
>
> # dd if=/dev/ad4 of=/dev/null bs=1024k count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes transferred in 30.606110 secs (35082597 bytes/sec)
>
> # grep '^[^#]' /usr/src/sys/i386/conf/GENERIC
> cpu        I686_CPU
> ident        GENERIC
> options     SCHED_4BSD        # 4BSD scheduler
> options     INET            # InterNETworking
> options     INET6            # IPv6 communications protocols
> options     FFS            # Berkeley Fast Filesystem
> options     SOFTUPDATES        # Enable FFS soft updates support
> options     UFS_ACL            # Support for access control lists
> options     UFS_DIRHASH        # Improve performance on big directories
> options     MD_ROOT            # MD is a potential root device
> options     NFSCLIENT        # Network Filesystem Client
> options     NFSSERVER        # Network Filesystem Server
> options     NFS_ROOT        # NFS usable as /, requires NFSCLIENT
> options     MSDOSFS            # MSDOS Filesystem
> options     CD9660            # ISO 9660 Filesystem
> options     PROCFS            # Process filesystem (requires PSEUDOFS)
> options     PSEUDOFS        # Pseudo-filesystem framework
> options     GEOM_GPT        # GUID Partition Tables.
> options     COMPAT_43        # Compatible with BSD 4.3 [KEEP THIS!]
> options     COMPAT_FREEBSD4        # Compatible with FreeBSD4
> options     SCSI_DELAY=15000    # Delay (in ms) before probing SCSI
> options     KTRACE            # ktrace(1) support
> options     SYSVSHM            # SYSV-style shared memory
> options     SYSVMSG            # SYSV-style message queues
> options     SYSVSEM            # SYSV-style semaphores
> options     _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time 
> extensions
> options     KBD_INSTALL_CDEV    # install a CDEV entry in /dev
> options     AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
>                     # output.  Adds ~128k to driver.
> options     AHD_REG_PRETTY_PRINT    # Print register bitfields in debug
>                     # output.  Adds ~215k to driver.
> options     ADAPTIVE_GIANT        # Giant mutex is adaptive.
> device        isa
> device        pci
> device        fdc
> device        ata
> device        atadisk        # ATA disk drives
> device        ataraid        # ATA RAID drives
> device        atapicd        # ATAPI CDROM drives
> device        atapifd        # ATAPI floppy drives
> device        atapist        # ATAPI tape drives
> options     ATA_STATIC_ID    # Static device numbering
> device        atkbdc        # AT keyboard controller
> device        atkbd        # AT keyboard
> device        psm        # PS/2 mouse
> device        vga        # VGA video card driver
> device        splash        # Splash screen and screen saver support
> device        sc
> device        agp        # support several AGP chipsets
> device        npx
> device        pmtimer
> device        sio        # 8250, 16[45]50 based serial ports
> device        ppc
> device        ppbus        # Parallel port bus (required)
> device        lpt        # Printer
> device        plip        # TCP/IP over parallel
> device        ppi        # Parallel port interface device
> device        miibus        # MII bus support
> device        re        # RealTek 8139C+/8169/8169S/8110S
> device        rl        # RealTek 8129/8139
> device        loop        # Network loopback
> device        mem        # Memory and kernel memory devices
> device        io        # I/O device
> device        random        # Entropy device
> device        ether        # Ethernet support
> device        sl        # Kernel SLIP
> device        ppp        # Kernel PPP
> device        tun        # Packet tunnel.
> device        pty        # Pseudo-ttys (telnet etc)
> device        md        # Memory "disks"
> device        gif        # IPv6 and IPv4 tunneling
> device        faith        # IPv6-to-IPv4 relaying (translation)
> device        bpf        # Berkeley packet filter
>
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